amanuensis
Concise Oxford English Dictionary © 2008 Oxford University Press:
amanuensis /əˌmanjʊˈɛnsɪs/
▶noun (pl. amanuenses /-siːz/) a literary assistant, in particular one who takes dictation.
– origin C17: L., from (servus) a manu ‘(slave) at hand(writing), secretary’ + -ensis ‘belonging to’.
'amanuensis' also found in these Oxford entries:

